Improvement in casting mold-boards



' BNITEEV STATES PATENT OFFICE.,

JAMES oLIvEE, oE soUTH BEND, INDIANA.

IMPROVEMENT' IN CASTING- MOLD-BOARDS.

Specification forming part of VLetters Patent o. 76,939, dated April 21, 1868. v

To all whom tracy concern Be it known that I, JAMES OLIVER, of South Bend, in the county of St. Joseph, in the State of Indiana, have invented a new and Improved Mode of Molding and Casting 'Mold-Boards for Plows, by which the concave or working surface of said mold-boards are chilled during the process of casting, by means of which all danger of rending or cracking is avoided, thus producing a very durable and cheap article of that description; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawing, and to the letters of reference marked therein, in which- Figure lis a plan or top view of a iiask used for molding and iitted up for that purpose. Fig. 2 is a view of the under side of the ask shown in Fig. 1. Fig. 3 is a vertical longitudinal section of my iiask taken in the line x.

The nature of my invention consists in providing the upper part' of my lask with a socalled chill, provided with any desirable number of recesses for holding cases, and made of cast-iron, which, instead of the sand, forms the cover of the mold, against which the cast metal forms itself into the desired shape'or form, at the same time cooling and becoming very hard or chilled Wherever it is in contact with the solid and comparatively cold metal of the socalled chill. The bottoni part of the mold, which forms the support of the casting, is of the ordinary kind of molding sand, causing the cast metal to cool oli'` gradually and assume a softer and tougher consistency than the top or concave part has, thereby offering greater. resistance to breakage than a thoroughly-chilled moldboard; also diminishing greatly the number of accidents during the manufacture to which said castings are subjected by the process of molding and casting heretofore used.

To enable others skilled in the art to make use of my invention I will describe its construction and operation.A

The ilask I use for may purpose is seen andl represented by A, Figs.' l, 2, and 3. It is of 'oblong shape, and its dimensions aslarge as necessary to keep it from burning or charring when the casting is performed. It consists ofan'upper and lower part, tted to each other, so that when separated they represent two longitudinally-inclined surfaces, as illustrated by the line c a', in Fig. 3. This is done to prevent a premature chilling of the metal when flowing in-to the mold too quickly and in thin streams, and stopping up its own passage in the mold. The rise ofthe metal, which is poured in at the lower end o', is gradual and in a bulk, always filling the mold through its entire breadth and thickness, thereby losing no heat which may result in theabovedescribed premature chilling. To this upper flask is attached aniron plate, B, which has, in a central position to iiask A, a pit or pan, C, of nearly the same depth ,as that of the upper flask, The bottom of said pit or pan forms the chilling portion or surface for the concave portion of my mold-board. The two ends of the flask present the same .shape as a crosssection of the moldhoard, for the purpose of easy management to the molder. Two pins, d d', Fig. 2, keep the said ilasks in place together. The chill C of plate B has several small recesses, c e e, for holding firmly the ends of cores, which make the necessary number ofbolt-holes in the mold-board, thus making the position of the bolt-holes uniform in all the mold-boardsast in this manner. Near the lower end of the inclined pit or pan the plate B is provided with a funnel, D, for the reception of the molten metal. This funnel is heavily coated with sand, to prevent its wearing by heat and its acting as a chill to the molten metal. Through this the metal enters the vertical hole f, from the lower end of which it divides into several branch canals, f1 f2 f3 f4, to supply an equal amount of fresh or hot metal across the whole breadth of the mold.

The lower ilask is filled With sand, which helps to form the convex part of the moldboard. I cast lugs upon themold-board for the purpose of fastening the plow-handlesVv`rr thereto.

The operation of my invention is very simple. After the molderhas performed his work in the usual manner, he iills the pit or pan U with hot water until the Whole casting B is warm, then the necessary amount of liquid metal is poured in at D. The metal enters the hole f, branches off at f1 f2 f3 f4, and gradually rises in the molded space until it is entirely lled. i The Water in the pit or pan C during the operation is steaming ofi' rapidly, which keeps up the chilling properties of the bottom of the pit or pan G in a moderate manner, and free from accident.

The castings when removed from the flask are packed close together and covered with sand, for `the purpose ot' retaining the heat and allowing a gradual cooling, and by this means preventing them from cracking.

What I claim as my invention, anddesire to secure by Letters Patent, is-

1. A chill provided with core-seats or recesses e e e, substantially as described, and for the purpose set forth.

2. In combination with the core-seats e e e the chamber'chill C, substantially as described.

In testimony whereof I have hereunto subscribed my name.

Witnesses: JAMES OLIVER.

G. D. C. SMITH, WM. J. MILLER. 

